I have tried creating and importing a 1m diameter sphere as both a solid and surface model in the .step format and notice the sphere has a seam and wrinkles at the ends. When I do the hex meshing for CFD, I get an error message “the tesselated surface is not closed”. I’ve reviewed other public projects modeling spheres and it seems they all have this problem unless the sphere was imported as an .stl. What is the best type of sphere model to import to get the best representative hex mesh for CFD? I also noticed when when I proceed with the simulation using the mesh in spite of the warning, the forces on the sphere surfaces were not calculated. I’m wondering if the is related to the meshing issues with the sphere.